diff options
Diffstat (limited to 'plugins/check_ssh.c')
-rw-r--r-- | plugins/check_ssh.c | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/plugins/check_ssh.c b/plugins/check_ssh.c new file mode 100644 index 0000000..d78189f --- /dev/null +++ b/plugins/check_ssh.c | |||
@@ -0,0 +1,285 @@ | |||
1 | /* | ||
2 | * check_ssh.c | ||
3 | * | ||
4 | * Made by (Remi PAULMIER) | ||
5 | * Login <remi@sinfomic.fr> | ||
6 | * | ||
7 | * Started on Fri Jul 9 09:18:23 1999 Remi PAULMIER | ||
8 | * Update Thu Jul 22 12:50:04 1999 remi paulmier | ||
9 | * $Id$ | ||
10 | * | ||
11 | */ | ||
12 | |||
13 | #include "config.h" | ||
14 | #include "common.h" | ||
15 | #include "netutils.h" | ||
16 | #include "utils.h" | ||
17 | |||
18 | #define PROGNAME "check_ssh" | ||
19 | |||
20 | #ifndef MSG_DONTWAIT | ||
21 | #define MSG_DONTWAIT 0 | ||
22 | #endif | ||
23 | |||
24 | #define SSH_DFL_PORT 22 | ||
25 | #define BUFF_SZ 256 | ||
26 | |||
27 | short port = -1; | ||
28 | char *server_name = NULL; | ||
29 | int verbose = FALSE; | ||
30 | |||
31 | int process_arguments (int, char **); | ||
32 | int call_getopt (int, char **); | ||
33 | int validate_arguments (void); | ||
34 | void print_help (void); | ||
35 | void print_usage (void); | ||
36 | |||
37 | char *ssh_resolve (char *hostname); | ||
38 | int ssh_connect (char *haddr, short hport); | ||
39 | |||
40 | int | ||
41 | main (int argc, char **argv) | ||
42 | { | ||
43 | |||
44 | if (process_arguments (argc, argv) == ERROR) | ||
45 | usage ("Could not parse arguments\n"); | ||
46 | |||
47 | /* initialize alarm signal handling */ | ||
48 | signal (SIGALRM, socket_timeout_alarm_handler); | ||
49 | alarm (socket_timeout); | ||
50 | |||
51 | /* ssh_connect exits if error is found */ | ||
52 | ssh_connect (ssh_resolve (server_name), port); | ||
53 | |||
54 | alarm (0); | ||
55 | |||
56 | return (STATE_OK); | ||
57 | } | ||
58 | |||
59 | |||
60 | /* process command-line arguments */ | ||
61 | int | ||
62 | process_arguments (int argc, char **argv) | ||
63 | { | ||
64 | int c; | ||
65 | |||
66 | if (argc < 2) | ||
67 | return ERROR; | ||
68 | |||
69 | for (c = 1; c < argc; c++) | ||
70 | if (strcmp ("-to", argv[c]) == 0) | ||
71 | strcpy (argv[c], "-t"); | ||
72 | |||
73 | c = 0; | ||
74 | while (c += (call_getopt (argc - c, &argv[c]))) { | ||
75 | if (argc <= c) | ||
76 | break; | ||
77 | if (server_name == NULL) { | ||
78 | server_name = argv[c]; | ||
79 | } | ||
80 | else if (port == -1) { | ||
81 | if (is_intpos (argv[c])) { | ||
82 | port = atoi (argv[c]); | ||
83 | } | ||
84 | else { | ||
85 | print_usage (); | ||
86 | exit (STATE_UNKNOWN); | ||
87 | } | ||
88 | } | ||
89 | } | ||
90 | |||
91 | return validate_arguments (); | ||
92 | } | ||
93 | |||
94 | |||
95 | /************************************************************************ | ||
96 | * | ||
97 | * Run the getopt until we encounter a non-option entry in the arglist | ||
98 | * | ||
99 | *-----------------------------------------------------------------------*/ | ||
100 | |||
101 | int | ||
102 | call_getopt (int argc, char **argv) | ||
103 | { | ||
104 | int c, i = 1; | ||
105 | |||
106 | #ifdef HAVE_GETOPT_H | ||
107 | int option_index = 0; | ||
108 | static struct option long_options[] = { | ||
109 | {"version", no_argument, 0, 'V'}, | ||
110 | {"help", no_argument, 0, 'h'}, | ||
111 | {"verbose", no_argument, 0, 'v'}, | ||
112 | {"timeout", required_argument, 0, 't'}, | ||
113 | {"host", required_argument, 0, 'H'}, | ||
114 | {0, 0, 0, 0} | ||
115 | }; | ||
116 | #endif | ||
117 | |||
118 | while (1) { | ||
119 | #ifdef HAVE_GETOPT_H | ||
120 | c = getopt_long (argc, argv, "+Vhvt:H:p:", long_options, &option_index); | ||
121 | #else | ||
122 | c = getopt (argc, argv, "+Vhvt:H:p:"); | ||
123 | #endif | ||
124 | |||
125 | if (c == -1 || c == EOF) | ||
126 | break; | ||
127 | |||
128 | i++; | ||
129 | switch (c) { | ||
130 | case 't': | ||
131 | case 'H': | ||
132 | case 'p': | ||
133 | i++; | ||
134 | } | ||
135 | |||
136 | switch (c) { | ||
137 | case '?': /* help */ | ||
138 | usage (""); | ||
139 | case 'V': /* version */ | ||
140 | print_revision (my_basename (argv[0]), "$Revision$"); | ||
141 | exit (STATE_OK); | ||
142 | case 'h': /* help */ | ||
143 | print_help (); | ||
144 | exit (STATE_OK); | ||
145 | case 'v': /* verose */ | ||
146 | verbose = TRUE; | ||
147 | break; | ||
148 | case 't': /* timeout period */ | ||
149 | if (!is_integer (optarg)) | ||
150 | usage ("Timeout Interval must be an integer!\n\n"); | ||
151 | socket_timeout = atoi (optarg); | ||
152 | break; | ||
153 | case 'H': /* host */ | ||
154 | server_name = optarg; | ||
155 | break; | ||
156 | case 'p': /* port */ | ||
157 | if (is_intpos (optarg)) { | ||
158 | port = atoi (optarg); | ||
159 | } | ||
160 | else { | ||
161 | printf ("Port number nust be a positive integer: %s\n", optarg); | ||
162 | usage (""); | ||
163 | } | ||
164 | } | ||
165 | |||
166 | } | ||
167 | return i; | ||
168 | } | ||
169 | |||
170 | int | ||
171 | validate_arguments (void) | ||
172 | { | ||
173 | if (server_name == NULL) | ||
174 | return ERROR; | ||
175 | if (port == -1) /* funky, but allows -p to override stray integer in args */ | ||
176 | port = SSH_DFL_PORT; | ||
177 | return OK; | ||
178 | } | ||
179 | |||
180 | |||
181 | /************************************************************************ | ||
182 | * | ||
183 | * Resolve hostname into IP address | ||
184 | * | ||
185 | *-----------------------------------------------------------------------*/ | ||
186 | |||
187 | char * | ||
188 | ssh_resolve (char *hostname) | ||
189 | { | ||
190 | struct hostent *host; | ||
191 | |||
192 | host = gethostbyname (hostname); | ||
193 | if (!host) { | ||
194 | herror (hostname); | ||
195 | exit (STATE_CRITICAL); | ||
196 | } | ||
197 | return (host->h_addr); | ||
198 | } | ||
199 | |||
200 | |||
201 | /************************************************************************ | ||
202 | * | ||
203 | * Try to connect to SSH server at specified server and port | ||
204 | * | ||
205 | *-----------------------------------------------------------------------*/ | ||
206 | |||
207 | int | ||
208 | ssh_connect (char *haddr, short hport) | ||
209 | { | ||
210 | int s; | ||
211 | struct sockaddr_in addr; | ||
212 | int addrlen; | ||
213 | int len; | ||
214 | char *output = NULL; | ||
215 | char *buffer = NULL; | ||
216 | char *ssh_proto = NULL; | ||
217 | char *ssh_server = NULL; | ||
218 | char revision[20]; | ||
219 | |||
220 | sscanf ("$Revision$", "$Revision: %[0123456789.]", revision); | ||
221 | |||
222 | addrlen = sizeof (addr); | ||
223 | memset (&addr, 0, addrlen); | ||
224 | addr.sin_port = htons (hport); | ||
225 | addr.sin_family = AF_INET; | ||
226 | bcopy (haddr, (void *) &addr.sin_addr.s_addr, 4); | ||
227 | |||
228 | s = socket (AF_INET, SOCK_STREAM, 0); | ||
229 | if (!s) { | ||
230 | printf ("socket(): %s for %s:%d\n", strerror (errno), server_name, hport); | ||
231 | exit (STATE_CRITICAL); | ||
232 | } | ||
233 | |||
234 | if (connect (s, (struct sockaddr *) &addr, addrlen)) { | ||
235 | printf ("connect(): %s for %s:%d\n", strerror (errno), server_name, | ||
236 | hport); | ||
237 | exit (STATE_CRITICAL); | ||
238 | } | ||
239 | |||
240 | output = (char *) malloc (BUFF_SZ + 1); | ||
241 | memset (output, 0, BUFF_SZ + 1); | ||
242 | recv (s, output, BUFF_SZ, 0); | ||
243 | if (strncmp (output, "SSH", 3)) { | ||
244 | printf ("Server answer: %s", output); | ||
245 | exit (STATE_CRITICAL); | ||
246 | } | ||
247 | else { | ||
248 | strip (output); | ||
249 | if (verbose) | ||
250 | printf ("%s\n", output); | ||
251 | ssh_proto = output + 4; | ||
252 | ssh_server = ssh_proto + strspn (ssh_proto, "0123456789-. "); | ||
253 | ssh_proto[strspn (ssh_proto, "0123456789-. ")] = 0; | ||
254 | printf | ||
255 | ("SSH ok - protocol version %s - server version %s\n", | ||
256 | ssh_proto, ssh_server); | ||
257 | buffer = | ||
258 | ssprintf (buffer, "SSH-%s-check_ssh_%s\r\n", ssh_proto, revision); | ||
259 | send (s, buffer, strlen (buffer), MSG_DONTWAIT); | ||
260 | if (verbose) | ||
261 | printf ("%s\n", buffer); | ||
262 | exit (STATE_OK); | ||
263 | } | ||
264 | } | ||
265 | |||
266 | void | ||
267 | print_help (void) | ||
268 | { | ||
269 | print_revision (PROGNAME, "$Revision$"); | ||
270 | printf ("Copyright (c) 1999 Remi Paulmier (remi@sinfomic.fr)\n\n"); | ||
271 | print_usage (); | ||
272 | printf ("by default, port is %d\n", SSH_DFL_PORT); | ||
273 | } | ||
274 | |||
275 | void | ||
276 | print_usage (void) | ||
277 | { | ||
278 | printf | ||
279 | ("Usage:\n" | ||
280 | " %s -t [timeout] -p [port] <host>\n" | ||
281 | " %s -V prints version info\n" | ||
282 | " %s -h prints more detailed help\n", PROGNAME, PROGNAME, PROGNAME); | ||
283 | } | ||
284 | |||
285 | /* end of check_ssh.c */ | ||